forked from cerc-io/ipld-eth-server
119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
package manet
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import (
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"net"
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ma "github.com/multiformats/go-multiaddr"
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)
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// Loopback Addresses
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var (
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// IP4Loopback is the ip4 loopback multiaddr
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IP4Loopback = ma.StringCast("/ip4/127.0.0.1")
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// IP6Loopback is the ip6 loopback multiaddr
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IP6Loopback = ma.StringCast("/ip6/::1")
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// IP4MappedIP6Loopback is the IPv4 Mapped IPv6 loopback address.
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IP4MappedIP6Loopback = ma.StringCast("/ip6/::ffff:127.0.0.1")
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)
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// Unspecified Addresses (used for )
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var (
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IP4Unspecified = ma.StringCast("/ip4/0.0.0.0")
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IP6Unspecified = ma.StringCast("/ip6/::")
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)
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// IsThinWaist returns whether a Multiaddr starts with "Thin Waist" Protocols.
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// This means: /{IP4, IP6}[/{TCP, UDP}]
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func IsThinWaist(m ma.Multiaddr) bool {
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m = zoneless(m)
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if m == nil {
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return false
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}
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p := m.Protocols()
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// nothing? not even a waist.
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if len(p) == 0 {
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return false
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}
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if p[0].Code != ma.P_IP4 && p[0].Code != ma.P_IP6 {
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return false
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}
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// only IP? still counts.
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if len(p) == 1 {
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return true
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}
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switch p[1].Code {
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case ma.P_TCP, ma.P_UDP, ma.P_IP4, ma.P_IP6:
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return true
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default:
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return false
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}
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}
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// IsIPLoopback returns whether a Multiaddr starts with a "Loopback" IP address
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// This means either /ip4/127.*.*.*/*, /ip6/::1/*, or /ip6/::ffff:127.*.*.*.*/*,
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// or /ip6zone/<any value>/ip6/<one of the preceding ip6 values>/*
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func IsIPLoopback(m ma.Multiaddr) bool {
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m = zoneless(m)
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c, _ := ma.SplitFirst(m)
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if c == nil {
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return false
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}
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switch c.Protocol().Code {
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case ma.P_IP4, ma.P_IP6:
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return net.IP(c.RawValue()).IsLoopback()
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}
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return false
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}
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// IsIP6LinkLocal returns whether a Multiaddr starts with an IPv6 link-local
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// multiaddress (with zero or one leading zone). These addresses are non
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// routable.
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func IsIP6LinkLocal(m ma.Multiaddr) bool {
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m = zoneless(m)
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c, _ := ma.SplitFirst(m)
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if c == nil || c.Protocol().Code != ma.P_IP6 {
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return false
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}
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ip := net.IP(c.RawValue())
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return ip.IsLinkLocalMulticast() || ip.IsLinkLocalUnicast()
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}
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// IsIPUnspecified returns whether a Multiaddr starts with an Unspecified IP address
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// This means either /ip4/0.0.0.0/* or /ip6/::/*
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func IsIPUnspecified(m ma.Multiaddr) bool {
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m = zoneless(m)
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if m == nil {
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return false
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}
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c, _ := ma.SplitFirst(m)
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return net.IP(c.RawValue()).IsUnspecified()
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}
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// If m matches [zone,ip6,...], return [ip6,...]
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// else if m matches [], [zone], or [zone,...], return nil
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// else return m
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func zoneless(m ma.Multiaddr) ma.Multiaddr {
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head, tail := ma.SplitFirst(m)
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if head == nil {
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return nil
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}
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if head.Protocol().Code == ma.P_IP6ZONE {
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if tail == nil {
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return nil
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}
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tailhead, _ := ma.SplitFirst(tail)
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if tailhead.Protocol().Code != ma.P_IP6 {
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return nil
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}
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return tail
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} else {
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return m
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}
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}
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